Fix integration tests in src/chrome and src/extensions so that we can turn on IO thread checks wi...

chrome/browser/extensions/service_worker_apitest.cc

Index: chrome/browser/extensions/service_worker_apitest.cc
diff --git a/chrome/browser/extensions/service_worker_apitest.cc b/chrome/browser/extensions/service_worker_apitest.cc
index 80336ceec993b44de96278c1323a670ec9e0f508..9d2dd5dea12e29340f1cafc10c9e6bad4d8e491a 100644
--- a/chrome/browser/extensions/service_worker_apitest.cc
+++ b/chrome/browser/extensions/service_worker_apitest.cc
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/gcm/fake_gcm_profile_service.h"
@@ -283,6 +284,7 @@ IN_PROC_BROWSER_TEST_F(ServiceWorkerTest, RegisterSucceeds) {
 }
 
 IN_PROC_BROWSER_TEST_F(ServiceWorkerTest, UpdateRefreshesServiceWorker) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ScopedTempDir scoped_temp_dir;
   ASSERT_TRUE(scoped_temp_dir.CreateUniqueTempDir());
   base::FilePath pem_path = test_data_dir_.AppendASCII("service_worker")
@@ -323,6 +325,7 @@ IN_PROC_BROWSER_TEST_F(ServiceWorkerTest, UpdateRefreshesServiceWorker) {
 }
 
 IN_PROC_BROWSER_TEST_F(ServiceWorkerTest, UpdateWithoutSkipWaiting) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ScopedTempDir scoped_temp_dir;
   ASSERT_TRUE(scoped_temp_dir.CreateUniqueTempDir());
   base::FilePath pem_path = test_data_dir_.AppendASCII("service_worker")